spheres.visualization.schwinger_spheres.SchwingerSpheres

class spheres.visualization.schwinger_spheres.SchwingerSpheres(state=None, scene=None, pos=<0, 0, 0>, show_plane=False)

Bases: object

Visualization for two oscillators as a tower of spin-j states. If show_plane=True, displays a representation of the 2D oscillator position states.

__init__(state=None, scene=None, pos=<0, 0, 0>, show_plane=False)

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__([state, scene, pos, show_plane])	Initialize self.
destroy()	Destroys the Schwinger spheres.
evolve([H, dt, T])	Evolves the state, updating the visual in real time.
lower_spin(spin)	Lowers a spin-j state.
measure(direction)	Applies a projective measurement (with random outcomes).
raise_spin(spin[, replace])	Raises a spin-j state.
random()	Load in a random state.
random_hamiltonian()	returns H – Random Hamiltonian of the right dimensions.
refresh()
vacuum()	Load in the vacuum state.

destroy()

Destroys the Schwinger spheres.

evolve(H=None, dt=0.05, T=6.283185307179586)

Evolves the state, updating the visual in real time.

Parameters

• H (qt.Qobj) – Hamiltonian. If provided with a first quantized Hamiltonian, automatically second quantizes.

• dt (float) – Time step.

• T (float) – Time interval.

lower_spin(spin)

Lowers a spin-j state.

Parameters

spin (qt.Qobj) –

measure(direction)

Applies a projective measurement (with random outcomes).

Parameters

direction (str) – “x”, “y”, “z”, or “q” (2D position).

raise_spin(spin, replace=False)

Raises a spin-j state.

Parameters

• spin (qt.Qobj) –

• replace (bool) – If True, raises the spin state from the vacuum.

random()

Load in a random state.

random_hamiltonian()

Returns

H – Random Hamiltonian of the right dimensions.

Return type

qt.Qobj

vacuum()

Load in the vacuum state.